Typically, deepwater subsea completions are characterized by significant production rates which require large completion hardware.  Slim-hole designs (defined as 5½” production casing and smaller) are usually avoided.  However, as the deepwater GOM basins grow more mature, sidetracks and challenging new drills are becoming more common.  Sidetracks are being performed out of large production casing, ending with 5½” or 5” casing at TD.  Additionally, many new drills either have to penetrate multiple depleted intervals or require more aggressive directional plans to reach smaller targets.  Both scenarios can result in slim-hole designs.

 

This presentation will outline the design, risk assessment, installation, and results for three subsea, slim-hole deepwater completions.  One is a 5” frac pack at 74 deg. deviation; one is a 5” frac pack across a >40,000 md-ft kH sand; and another is a 5½” high-rate water pack at 25,000 ft TVD.  It will be shown that, as a result of proper planning, all three were successfully executed.